Implement for forming metal backs for artificial teeth.



E. DE W. R. GARDEN.

IMPLEMENT FOR FORMING METAL BACKS FOR ARTIFICIAL TEETH. APPLICATION EILBD SEPT. 29,1913.

1,1 1 3,325. Patnted Oct. 13, 1914;

e v J v i v i E m t m) g I 2' WITNESSES:

HEW I (2M a wy Zwfi.

Angeles nnrrn ERNEST DE wrrr a. GARDEN, or'Los anennns, 'oanrronnm.

IMPLEMENT FOR FORMING METAL BACKS FOR ARTIFICIAL TEETH.

Specification of Letters Patent. p t nt doct, 3, 1914,

Application filed September 29, 1913. Serial No. 792,471. i I

To all 'whom it may concern Be it known that I, ERNEST DE IVITT R.

"GARDEN, citizen of the United States, residing at'Los Angeles, in the county of Los and State of California, have invented certain new and useful Improvements in Implements for Forming Metal Backs for Artificial Teeth, or which the following is a fulland clear specification.

My invention relates to improvements in implements for forming metal hacks for artificial teeth in which a metalback is formed complete in a single operation, and consists of certain novel features of construct-ion and arrangement of mechanical parts which arev fully described in the following specification and claims.

The object of this invention is to produce a simple, cheap and efiicient implement,

which will enable the individual dentist to easily and readily form these metal backs at a very nominal cost.

With this end in new produce a very simple and efficient implement by simply .hinging a pair of handled levers together at one end, thereby forming an effective clamping device, upon the inner opposing surfaces of which are mounted the coacting members of centralizing the springs s, s, which are Well illustrated in the accompanying drawing, in which- Figure l is an elevation of the assembled implement in the position occupied at the completion of the first step in the operation of forming the metal back. Fig. 2, is a top view of thelower handled lever of the implement as illustrated in Fig. ,1, the handle portion being broken away. Fig. 3, is a bottom view of the top member as illustrated in Fig. 1, the handle portionalso being broken away. Fig. 4, is a view in Fig. 1, taken on line X, K. Fig. 5, is a view in cross section of Fig. 1, taken on line Y, Y.

Figs. (3, 7 and 8, are respectively a plan, end and side elevation of the metal back when formed complete and ready for the opera tion of mounting the teeth upon them. Figs. 9 and 10, are respectively a plan and pointed out in the cross section of face h, of the lug side elevation of a tooth mounted'upon the metal back, ready for trimming the edges of the metal preparatory to burnishing them down againstthe edge of the tooth. Figs.

t3, 7 8, 9,, and 10, form no part of the present invention, butare shown to illustrate the finished product of the implement, and its method of application.- f

1 Similar 'letters refer to similar parts throughout the several views.

The implement is composed principally of two handled levers A, and B, which are hinged together .at, C. Forming levers D, and E,.are pivotallyzniounted upon a common center, upon'the, handled lever A, as

seen at F. A springchamber Gr, isformed in, and transversely of the handled lever A, as shown, and elongated slots at, and a, are formed through theupper wall thereof, as shown in Fig. 4c. Pins 5, and b, are rigidly secured to, and project downwardly from the forming levers D, and E, through the slots a, and 0., and terminate within the spring-chamber G, and is well illustrated in Fig. 4c. The relative positions of the slots a, a, and the pins 5, 7), serve to limit the outward movement of the forming levers D, and A spring 0, is interposed between the pins 6, Z), within the spring-chamber Gr,

and is of such tension or resistance as to hold the said lug is formed upon a radius from.

the pivotal center of the forming levers D, and E, and designated by the letter F. The forming levers D, and E, are notchedto receive and encirclethe lug H, and the said notches are designated by the letters 11,41, the surfaces 7', j, areof the same radius as the H, and is fitted to work over the same freely but closely. Pins 70, 7c, are rigidly secured to, and project upwardly from, the forming levers I), and E, for a purpose which will be fully hereinafter explained.

A male forming member 1 is secured to the handled lever B, by collar screws m, m. The male forming member 1, is shown in Figs. 1, 3, a and 5, and the collarscrews are illustrated in Figs. 1, and 5. The collarscrews m, m, are fitted to slide freely in the holes 12, n, in the handled lever B, the purpose of which will be fully explained later on. A housing J, is-secured to the outer side of the handled lever B, by screws 0, 0, shown in Figs. 1, and 4. The housing J, is provided with two spring-chambers p, 39, shown in Fig. 5.

The collar-screws m, m, are provided with extensions 7*, T, which extend upwardly into the spring-chambers 2, 29, for the purpose of centralizing, the springs s, s, which are confined within the spring-chambers p, p, and rest upon the collars t, t, of the collarscrews m, m, with suflicient'tension to overcome the resistance of the first operation of forming the metal backs, these backs being illustrated in Figs. 6, 7, 8, 9 and 10. The

springs s, s, also serve the purpose of keeping the maleforming member I projected downward to its normal position, until the completion of the first stage of the forming operation, and allowing it to recede during the second and final operation of forming the metal back referred to above. The springs s, s, impart a resiliency to the action of the male forming member I, which is highly beneficial in the forming up of articles from sheet metals.

A yoke K, having downwardly projecting limbs L, L, which are in turn provided with beveled faces u, u, is secured to the handled lever B, by screws 2), o, and is located forward of the male forming member I.

Having completed the mechanical construction of the implement I will now proceed to describe its operation; opening the handled levers A, and B, such distance as will admit of conveniently placing a small square or rectangular piece of metal of the required dimensions and thickness over the levers D, and E, and against the pins 70, 7c, and the handled levers started upon their closing movement, in the course of which, the male forming member I contacts with the metal to be formed, and carries it down between the levers D, and E, which operation causes the metal to conform to the inner tapered face of the said male forming member I. lVhen the male forming member I, has carried the metal down between the levers D, and E, to its predetermined depth, a further movement of the handle members causes the beveled faces a, u, on the limbs L, L, of the yoke K, to contact with the outer edges of the levers D, and E, and a continued closing pressure of the handled levers A, and B, results in swinging the said levers inwardly and closing the metal snugly against the beveled sides of the male forming member I, thereby completing the operation of forming the metal back.

Having thus described my invention what I claim and desire to secure by Letters Patent is 1. In an implement for forming metal hacks for artificial teeth, a pair of hinged handled levers, a pair of pivoted levers mounted upon one of said levers, and a male forming member mounted upon the other handled lever, and adapted to cooperate with the pivoted levers upon the other lever, substantially as described.

2. In an implement of the character described, for forming metal hacks for artificial teeth, a pair of handled levers hinged at their outer ends, a pair of levers pivotally mounted upon one of said handled levers, a chamber in said handled lever, and means within said chamber for holding the said levers normally open, a male forming member mounted upon the other handled lever, and coacting with the pivoted levers upon the first mentioned lever, means for closing the said pivoted levers secured to the second mentioned handled lever all arranged and operating substantially as shown and described.

3. In an implement of the character described, for formingmetal hacks for artificial teeth, a pair of hinged handled levers,apair of levers, having tapered and beveled faces, pivotally mounted upon one of said hinged handled levers, a transverse chamber in said hinged handled lever, longitudinal slots perforating the wall of said chamber, pins in said levers projecting the said slots into said chamber, a spring in said chamber, and under tension between said pins, and holding the said levers normally open, a male forming member yieldingly mounted upon the other of said hinged handled levers, and coacting with the said pivotedd'levers upon the first mentioned hinged handled lever, a yoke, having downwardly projecting limbs, said limbs being provided withbeveled faces, said yoke secured to the second mentioned hinged handled lever, and adapted to contact with and swing the pivoted levers upon the first mentioned hinged handled lever inwardly, substantially as shown and described, and for the purpose specified.

4-. In an implement of the character described, for forming metal backs for artificial teeth, a pair of hinged handled levers, a pair of spring opened levers pivoted upon one of said hinged handled levers, a male forming member, secured to the other hinged handled lever, by collar-screws slid downwardly through ably passing through said hinged handled mal position substantially as shown and de- 10 lever, collars upon said collar-screws t0 scribed and for the purpose specified.

limit the movement of the said male forming In testimony whereof I afiix my signature member inwardly, springf chambers mounted in the presence of two Witnesses. upon the outer side o the said hinged 1 I handled member, and springs in said cham- ERNEST DE WITT GARDEN' bers, and exerting tension upon the collar Witnesses:

portion of said collar-screws to hold the M. SEIBT,

male forming member in its inwardly nor- J. C. FRYE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Batents,

- Washington, D. G. 

